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