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