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