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