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