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