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