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