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