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