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