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