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