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