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)(19,24)(20,28)(21,30)(22,26)(23,25)(27,32)(29,31)(3,8)(5,7)(9,11)(10,13)(12,15)(14,16)(17,18,23,30,22,26,21,25)(19,24,31,20,27,32,28,29)(1,3,4,8)(2,5,6,7)(17,19,22,27)(18,24,26,32)(20,25,29,30)(21,28,23,31)(2,6)(5,7)(11,15)(13,16)(19,27)(20,29)(24,32)(28,31) involution — undirected(17,20,21,24,22,29,23,32)(18,19,25,28,26,27,30,31)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.