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