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