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