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