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)(21,22,26,28,25,30,24,29)(23,31,32,27,34,36,33,35)(1,2)(3,4)(5,7,9,15)(6,10,13,20)(8,17,18,16)(11,14,12,19)(2,4)(21,23)(22,27)(24,32)(25,34)(26,33)(28,31)(29,36)(30,35) involution — undirected(6,11)(7,15)(8,18)(10,19)(12,13)(14,20)(21,24,25,26)(22,28,30,29)(23,32,34,33)(27,31,35,36)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.