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