One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,6,7,8)(9,10,12,14)(11,15,16,13)(17,18,22,25)(19,23,28,29)(20,21,30,24)(26,27,31,32)(9,11)(10,13)(12,16)(14,15)(17,19,22,28)(18,23,25,29)(20,27,30,32)(21,31,24,26)(2,5)(6,8)(10,14)(11,16)(17,20,25,21,22,30,18,24)(19,26,23,32,28,31,29,27)(10,14)(13,15)(20,30)(21,24)(26,31)(27,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,25,30,22,24,18,20)(19,27,23,26,28,32,29,31)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.