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