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