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