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