One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,9,6,4,13,8)(3,7,11,15,12,10,16,14)(17,18,23,27,22,25,21,26)(19,28,31,24,29,32,30,20)(1,3,5,11,6,12,13,16)(2,7,9,15,4,10,8,14)(17,19)(18,24)(20,25)(21,31)(22,29)(23,30)(26,32)(27,28)(1,4)(2,6)(3,10)(5,8)(7,12)(9,13)(11,14)(15,16)(17,20,22,24)(18,19,25,29)(21,28,23,32)(26,31,27,30)(18,25)(19,29)(26,27)(30,31) 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.