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