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