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