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