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