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