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