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