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