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