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