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