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