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