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