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