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