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