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