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