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