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