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