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