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)(13,14,17,15)(16,19,20,18)(21,22)(23,29)(24,32)(25,26)(27,31)(28,33)(30,34)(35,36)(8,12)(10,11)(13,14,17,15)(16,19,20,18)(22,25)(27,29)(28,32)(34,35)(6,7)(10,11)(14,15)(18,19)(21,23)(22,27)(24,30)(25,29)(26,31)(28,34)(32,35)(33,36) involution — undirected(1,2)(3,4)(5,7,9,6)(8,11,12,10)(13,15,17,14)(16,19,20,18)(21,24,26,33)(22,28,25,32)(23,30,31,36)(27,34,29,35)(5,8)(6,10)(7,11)(9,12)(13,16)(14,18)(15,19)(17,20)(21,25,26,22)(23,29,31,27)(24,28,33,32)(30,34,36,35)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.