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)(11,16)(12,15)(13,14)(17,18)(19,27)(20,25)(21,23)(22,26)(24,28)(29,40)(30,42)(31,41)(32,37)(33,35)(34,36)(38,43)(39,46)(44,47)(45,48) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,16)(12,15)(13,14)(18,23)(19,28)(20,31)(22,34)(25,39)(29,44)(32,45)(33,46)(35,41)(37,47)(38,42)(40,48)(1,3,5,4)(2,7,8,6)(10,14)(15,16)(17,19)(18,24)(20,32)(21,28)(22,30)(23,27)(25,40)(26,38)(29,33)(31,44)(34,43)(35,37)(36,42)(39,47)(41,48)(45,46)(9,11,13,12)(10,15,14,16)(17,20,22,31,21,33,34,46)(18,25,26,41,23,35,36,39)(19,29,30,45,28,32,43,44)(24,37,38,47,27,40,42,48)(1,4,5,3)(2,7,8,6)(9,12,13,11)(10,15,14,16)(18,23)(19,28)(25,35)(26,36)(29,32)(30,43)(39,41)(44,45)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.