One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,7)(3,11,12,8)(4,5,10,9)(13,14,16,15)(17,18,23,26)(19,24,27,21)(20,22,25,31)(28,29,32,30)(33,34,39,37)(35,40,36,43)(38,41,46,45)(42,47,44,48)(2,7)(3,12)(4,10)(14,15)(17,19)(18,24)(20,28)(21,26)(22,29)(23,27)(25,32)(30,31)(34,37)(40,43)(41,45)(47,48) involution — undirected(2,7)(4,10)(8,11)(13,16)(19,27)(21,24)(28,32)(29,30)(33,35,39,36)(34,40,37,43)(38,42,46,44)(41,47,45,48)(1,3)(2,8)(4,13)(5,15)(6,12)(7,11)(9,14)(10,16)(17,20)(18,22)(19,28)(21,30)(23,25)(24,29)(26,31)(27,32)(33,36,39,35)(34,40,37,43)(38,42,46,44)(41,48,45,47)(1,4,6,10)(2,9,7,5)(3,13,12,16)(8,14,11,15)(17,21)(18,19)(20,30)(22,28)(23,24)(25,29)(26,27)(31,32)(33,37,39,34)(35,40,36,43)(38,45,46,41)(42,47,44,48)(1,5,6,9)(2,10,7,4)(3,14,12,15)(8,13,11,16)(17,22)(18,25)(19,29)(20,26)(21,28)(23,31)(24,32)(27,30)(33,38,39,46)(34,41,37,45)(35,42,36,44)(40,47,43,48)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.