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