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