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