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