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