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