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