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