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