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