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