One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,7)(3,11,14,8)(4,5,10,9)(12,13,15,16)(17,18,23,26)(19,22,25,32)(20,21,24,31)(27,28,29,30)(33,34,39,37)(35,40,36,42)(38,41,46,45)(43,47,44,48)(2,7)(4,10)(8,11)(12,15)(17,19)(18,22)(20,29)(21,30)(23,25)(24,27)(26,32)(28,31)(33,34)(35,40)(36,42)(37,39)(38,41)(43,47)(44,48)(45,46) involution — undirected(2,7)(5,9)(8,11)(13,16)(19,25)(22,32)(27,29)(28,30)(33,35,39,36)(34,40,37,42)(38,44,46,43)(41,48,45,47)(1,3,6,14)(2,8,7,11)(4,15,10,12)(5,13,9,16)(17,20)(18,21)(19,27)(22,28)(23,24)(25,29)(26,31)(30,32)(33,36,39,35)(34,40,37,42)(38,44,46,43)(41,47,45,48)(1,4,6,10)(2,9,7,5)(3,12,14,15)(8,13,11,16)(17,21)(18,24)(19,28)(20,26)(22,29)(23,31)(25,30)(27,32)(33,37,39,34)(35,42,36,40)(38,45,46,41)(43,48,44,47)(1,5,6,9)(2,10,7,4)(3,13,14,16)(8,12,11,15)(17,22,23,32)(18,25,26,19)(20,28,24,30)(21,29,31,27)(33,38,39,46)(34,41,37,45)(35,43,36,44)(40,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.