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