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