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