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