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