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