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