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