One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,13,10,14,20,16)(7,15,12,8,17,18,19,11)(21,22,25,28,26,24,35,29)(23,30,32,31,34,36,33,27)(1,2)(3,4)(5,7,10,17)(6,11,14,8)(9,19,20,12)(13,18,16,15)(21,23,26,34)(22,27,24,31)(25,33,35,32)(28,36,29,30)(2,4)(21,24)(22,26)(23,31)(25,29)(27,34)(28,35)(30,33)(32,36) involution — undirected(5,8,10,11)(6,12,14,19)(7,16,17,13)(9,15,20,18)(23,32)(25,35)(27,30)(28,29)(31,36)(33,34)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.