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