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