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