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