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