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