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