One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,8)(6,7)(9,10)(11,12,15,16)(13,19,20,17)(14,22,23,18)(21,24,26,25)(27,28)(29,33)(30,37)(31,32)(34,38)(35,41)(36,39)(40,42)(3,5,7,10)(4,8,6,9)(12,16)(13,20)(18,22)(21,26)(28,32)(33,39)(34,37)(40,41)(4,6)(8,9)(11,12)(13,17)(14,18)(15,16)(19,20)(21,24)(22,23)(25,26)(27,29,31,36)(28,33,32,39)(30,35,38,42)(34,40,37,41)(3,6,7,4)(5,9,10,8)(11,13,15,20)(12,17,16,19)(14,21,23,26)(18,24,22,25)(27,28)(29,33)(30,34)(31,32)(35,40)(36,39)(37,38)(41,42)(3,5)(4,8)(6,9)(7,10)(11,14,15,23)(12,18,16,22)(13,21,20,26)(17,24,19,25)(27,30,31,38)(28,34,32,37)(29,35,36,42)(33,40,39,41)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.