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