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