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