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)(17,18,22,25,23,19,21,27)(20,24,30,31,28,26,29,32)(1,3)(2,6)(4,10)(5,9)(7,12)(8,13)(11,15)(14,16)(17,19,23,18)(20,24,28,26)(21,25,22,27)(29,32,30,31)(3,9)(6,12)(10,15)(13,16)(17,20)(18,24)(19,26)(21,29)(22,30)(23,28)(25,31)(27,32) involution — undirected(2,7)(6,12)(8,14)(13,16) involution — undirected(20,28)(24,26)(29,30)(31,32) 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.