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