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