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