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