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