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