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