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