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