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